Slotting-machine.



PATENTBD JAN. 20, 1903.

-R wm NG RA MM G HN BH D10 L S APPLICATION FILED MAR. 19. 1902.

Z'SHEETB-SHBET 1- NO. KODEL.

No. 718,930. PATENTED JAN. 20, 1903.

4 P. B. HARRISON.

SLOTTING MACHINE.

.avrnlcxrronV FILED MAR. 19, 1902. no MODEL. s sums-:SHEET z.

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MIF/mills I [Z4 lilrtirnn drains Artnr OFFICE.

PHILIP B. HARRISON, OF CHICAGO, ILLINOIS, ASSIGNOR TO CHICAGO RAIL- WAY EQUIPMENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SLOTTING- SPECIFICATION' forming part of Letters Patent No. 718,930, dated January 20, 1903.

Application filed March 19, 1902. Serial No. 98,934. (No model.)

To cir/ZZ when?, it may concern:

Be it known that I, PHILIP B. HARRISON, a citizen of the United States, residing at Chicago, Cook county, State of Illinois, have in- 5 vented a certain new and useful Improvement in Slotting-Wlachines, of which the following is a full, clear, and exact description, such as-will enable others skilled in the art to which it appertains to make and use the same,

Io reference being had to the accompanying drawings, forming part of this specication, in which- Figure lis a side elevation, the gage-block being shown in section. Fig. 2 is a top plan I5 view. Fig. 3 is a top plan view of the forward portion of the mandrel, the die-blocks being removed. Fig. 4 is a side elevation of the same. Fig. 5 is a front end elevation. Figs. 6, 7, 8, and 9 are transverse sectional zo elevations taken, respectively,on the lines 6 6, 7 7, S 8, and 9 9 of Fig. l, Fig. 6 showing the punch in rear elevation, and Fig. 7 showing the same in sectional elevation. Fig. l is a front elevation of the punch, and Fig. 1l is a z front elevation of the rear die-block.

My invention relates to slotting-machines of the type forming the subject-matter of patent granted December i, 1891, to Henry B. Robischung, No. 464,307, and more particu- 3o larly to the punch and die of such machines.

My object is to provide an efficient construction by means of which a piece of material can be wholly punched from a cold pipe or tube, no weak corners being produced in the pipe and a wall being left entirely about the resulting slot, whereby torsional strain upon the slot-walls is distributed. This is particularly advantageous in pipe used for the construction of brake-beams.

Further objects are to afford a convenient and efficient construction of die, to provide for the ready removal of the punched material from the die, to provide an improved punch, and to provide means whereby during the punching action the tendency of the operating parts is to force the pipe against the gage-block or other stop.

To these ends and also to improve generally upon apparatus of the character indicated my invention consists in the various matters hereinafter described and claimed.

Referring now Inore particularly to the drawings, l represents a mandrel which is of the general construction of the mandrel disclosed in the before-mentioned patent and is designed to be mounted in the manner disclosed in the said patent. Said mandrel can be conveniently termed the stock or body portion of the present device, and for convenience I shall herein term as the rear that end of the mandrel which in practice is secured to the support, (said end being here shown as threaded,) and shall term the other end of said mandrel the front or forward end. The mandrel is preferably rounded in cross-section, and from its forward end to a suitable distance in rear of the same its upper portion is cut away to produce a portion of reduced height having a flat upper surface 2 and an upper surface 3 immediately in rear of said surface 2, said surface 3 being slightly above the said surface 2, and the forward edge of said surface 3 being cut away, as shown at 4, to produce, in effect, an extension of the said surface 2 under the hereinaftermentioned punch slot or opening. The sides of the mandrel are provided with recesses 5, which extend from a point slightly in rear of the forward face of said mandrel to the forward face of the surface 3, said recesses being open upon their upper sides, and these recesses produce front, rear, and bottom walls or shoulders 6, 7, and 8, respectively.

The die proper is composed of four blocks or sections. The forward of these, 9, is saddie-shaped, having a curved upper portion 10 and depending legs or side portions 1l. The exterior curvature of said portion 10 conforms closely to the interior curvature of the pipe to be operated upon, and the legs 11 iit in the forward ends of the recesses 5 and have their under and forward surfaces in engagement with the walls 6 and 8,respectively. The said legs extend somewhat above the surface 2 and are thickened above said surface, as shown at 12, Fig. 6. The curved upper portion 10 thus lies considerably above said surface 2, whereby a channel or passage 13 is produced, said channel opening at the front end of the mandrel and permitting convenient withdrawal of the material punched from the pipe, as will be more fully hereinafter described. Straight side die-blocks 14 fit in the recesses between the rear faces of the legs of the forward die-block and the shoulders 7, said side die-blocks being cut away upon their inner faces to produce recesses 15, as shown in Fig. 7, and being further reduced in thickness below said recesses, thus producing a shoulder 16, which lies above the surface 2. The upper outer surface of each side die-block is curved in cross-section to conform to the curvature of the outer upper surface of the before-mentioned forward dieblock. The rear die-block 17 extends between the rear ends of. the side die-blocks and the shoulder 18 between the surface 3 and the portion of the mandrel in rear of the same and has a fiat under surface which its upon the surface 3, its upper surface being curved to conform to the curvature of the outer curved surfaces of the die-blocks heretofore described. Preferably the under portion of the block 17 is provided with a central longitudinal rib 20, which ts into a groove 21 in the mandrel, thus holding the block against lateral displacement, and a headed screw 22, countersnnk into the dieblock, extends through the same and engages a threaded socket 23 in the mandrel. I also prefer to undercut the forward face of the said die-block for a purpose to be hereinafter explained, the downwardly and rearwardly extending recess 24 thus produced extending to the under surface of said die-block. The

opposing faces of the front and rear dieblocks are provided with outwardly-curved recesses 25, the walls of which extend from the lines of the inner faces of the side diebloclis, and the said several die-blocks when assembled thus produce a punch-opening having straight sides and curved ends, the upper edges of the walls of said punch opening or slot cooperating with the punch in a well-understood manner and the said walls being slightly undercut, as is usual in dies. The pipe to be operated upon being slipped over the forward end of the mandrel and the portion ofsaid pipe desired to be cut out being positioned over the punch-opening, the descent of the punch serves to sever said pipe portion from the remainder thereof, and the material thus punched out falls upon the surface 2. The side die-blocks being recessed, as heretofore described, and the space between the legs of the forward die-block being equal to the distance between the walls of said recesses, the punched-out piece of material lies loosely upon the said surface 2. An extractor having a hooked end is inserted from the forward end of the mandrel through the channel or passage 13 and above the punched-ont material, the said hooked end entering the recess 24, if necessary, and engaging the rear face of said punched-out material, whereby the said material is readily withdrawn from the punch-slot through the said passage 13. The forward and side dieblocks are usually riveted upon the mandrel; but the rear die-block is preferably secured in position by the screw, as heretofore described, whereby said block can be removed, if desired, and access can thus be had to the space bounded by the said blocks. A gageblock or other suitable stop 26 is provided, against which the end of the pipe bears when the same is positioned upon the mandrel, and I have here shown this gage-block as of the construction illustrated in the hereinbeforementioned patent. The pipe-receiving portion of the mandrel-JL'. e., the portion in advance of the forward face of the stop or gageblock-is of slightly less diameter than the interior of the pipe designed to be operated upon, the outer upper surfaces of the dieblocks being raised slightly and the sides of the front and side die-blocks and of the mandrel in advance of the same being straight.

This provides for easily placing the pipe upon the mandrel and for proper seating ofthe portion of the pipe from which the piece is to be punched.

The punch 27 is of the shape of the punchslot-1'. e., it has straight sides and outwardlycurved endsand its operative face is inclined upwardly and toward the gage-block when the punch and die are mounted for cooperation. I shall designate as the'front of the punch that part which lies toward the gageblock. The front and sides of the punch are provided with cutting edges 28 and 29, which lie in the same oblique plane, the side cutting edges 29 being produced by gutter-grinding the under surface of the punch and the front cutting edge being produced by sloping the inner wall of the lower punch-face upwardly and inwardly to meet the curved surface of the gutter 30. The said gutter opens upon the rear end of the punch, and its curvature conforms to the exterior curvature of the pipe to be operated upon, whereby as the punch descends its rear edge first engages the `pipe and said pipe is then continuously sheared toward the gage-block and away from the rear punch portion, this action being due to the inclination of the operative face of the punch and tending to force the pipe end against the gage-block, as will be well understood.

I am aware that many minor changes in the construction, arrangement, and combination of the several parts of my device can be made and substituted for those herein shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a device of the character indicated, a

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stock, and a separate die member, said die member having an upper plate spaced from said stock and side plates engaging said stock, whereby said stock, upper plate and side plates produce a channel leading from the punchopening of the die; substantially as described.

2. In a device of the character indicated, a stock having a portion of reduced height forming a shoulder with the main portion of said stock, said portion of reduced height having :recesses in its sides whereby there are produced shoulders which oppose said first-mentioned shoulder, and a die fitting between said opposing shoulders, said die having a top plate across the surface of said portion of reduced height and side plates tting in said recesses against said latter-mentioned shoulders; substantially as described.

3. In a device of the character indicated, a stock having a portion of reduced height forming a shoulder with the main portion of said stock, said portion of reduced height having recesses in its sides whereby there are produced shoulders which oppose said rst-mentioned shoulder, and a die fitting between said opposing shoulders, said die having a top plate spaced from the surface of said portion of reduced height and side plates fitting in said recesses and against said latter mentioned shoulders, whereby a channel is produced, said channel having its end open; substantially as described.

4t. In a device of the character indicated, a stock, and a die upon said stoel; and having the lower side of its punch-opening closed, said die having a removable section to afford access to the punch-opening; substantially as described.

5. lu a device of the character indicated, a stock, side die-sections secured to the sides thereof, and an end die-section having side legs secured to the sides of said stock and a cross-plate upon said legs and extending between said side die-sections; substantially as described.

6. In a device of the character indicated, a stock having a portion of reduced height whereby a shoulder is produced, side die-sections secured to the sides of said portion of reduced height, an end die-section having legs secured to the sides of said portion of reduced height and a cross-plate upon said legs and extending between said side die-sections, and a second end die-section tting upon said stock between said shoulder and the ends of said side die-sections; substantially as described.

7. In a device of the character indicated, a stock, a die secured thereto and having a plate across said stock and spaced therefrom to produce a passage, the die-wall opposite said passage being provided with an undercut recess; substantially as described,

8. In a device of the character indicated, a mandrel whose cross-section is less than that of the opening of the pipe adapted to receive said mandrel, a die upon said mandrel, and a raised surface about the punch-opening of said die and conforming to the interior pipesurface adapted to rest thereon; substantially as described.

9. The combination with a die, and agageblock, of a punch, there being means whereby cooperative action of said punch and die tends to force the article operated upon against said gage-block; substantially as described.

l0. The combination with a gage-block, and a die, of a punch, one of said last two mentioned parts being so inclined that as the other thereof cooperates with the same, the said cooperative action tends to force the article being acted upon against said gageblock; substantially as described.

1l. The combination withadie, and a gageblock, of a punch whose operative surface is inclined upwardly toward said block; substantially as described.

l2. A punch having a forwardly and upwardly inclined operative surface, said surface being gutter-ground to produce side cutting edges, and a front cutting edge included in substantially the oblique plane which includes said side cutting edges, said gutter extending to the rear edge of said punch; substantially as described.

13. A punch having a forwardly and upwardly inclined operative surface, said surface being gutter-ground to produce side cutting edges, and a front cutting edge included in substantially the oblique plane which includes said side cutting edges, said gutter eX- tending to the rear edge of said punch, the curvature of said gutter corresponding to that of the exterior of the article to be acted upon substantially as described.

14. The combination with a die having a curved surface aboutits punch-opening, of a punch having a forwardly and upwardly inclined operative surface, said surface being glitter-ground to produce side cutting edges, and a front cutting edge included in substantially the oblique plane which includes Said side cutting edges, said gutter extending to the rear edge of said punch, the curvature of said gutter corresponding to that of said curved surface; substantially as described.

In testimonyV whereof I hereunto affix my signature, in the presence of two witnesses, this 14th day of March, 1902.

PHILIP B. HARRISON.

Vitn esses:

E. T. WALKER, CHARLES F. HUNTooN.

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